My problem appears to be different from most on here. On auto the passenger side thermostat works correctly but the driver side wont turn up past 69 degrees. if I keep turning it up it gets to 69 then starts to turn down. If i do it on degree then wait a few minutes and turn it up 1 more degree then repeat process sometimes I can get it to as high as 71 before it jumps back to 65. Any ideas what I need to do to fix it. This is my wife's everyday driver and she is tired of being cold.

 

Might be your ambient atmo temp. sensor needs to be re-calibrated. Turn the key on and hold the A/C and Recirc buttons at the same time for 5 seconds. That will solve that issue.

 

That worked. Thank you so much oilcanhenry.